U110017 - U110017 Voltage Too High

Fault Depth Definition

U110017 Voltage High is a critical diagnostic fault code detecting power supply anomalies in the Left Rear Millimeter-Wave Radar control system of this vehicle model. This fault code represents an out-of-tolerance status of the power rail within the fault hierarchy of the On-Board Network System. Specifically, this code indicates that when the Electronic Control Unit (ECU) monitors a significant drift in the main supply voltage value connected to the Left Rear Millimeter-Wave Radar system, it is judged as a high-voltage anomaly event. This is not only a trigger signal for an electrical protection mechanism but also reflects the core logic of real-time health management of vehicle high-voltage networks by the control system. Architecturally, this fault code is associated with the feedback loop of the automotive power management system, aiming to prevent hardware damage or system erroneous calculation caused by excessive input energy.

Common Fault Symptoms

When the Left Rear Millimeter-Wave Radar system determines that the U110017 fault is activated, drivers or vehicle management systems will typically observe the following specific driving experience and feedback phenomena:

• Sensor Function Failure: The millimeter-wave radar hardware installed at the rear left stops working, causing the object detection, ranging, and velocity calculation functions originally responsible by this system to be completely lost.
• Driver Assistance System Limitations: Adaptive Cruise Control (ACC) or Rear Collision Warning Systems relying on radar data may enter a limited mode or be temporarily disabled.
• Instrument Panel Fault Indication: Relevant warning indicators on the vehicle instrument panel may light up, notifying drivers of abnormal radar system status.
• Safety Redundancy Triggered: To ensure driving safety, when voltage anomalies are confirmed to exist, vehicle-related automatic braking or anti-collision algorithms will no longer make decisions based on data from this sensor.

Core Fault Cause Analysis

From a technical diagnostic perspective, the generation of U110017 can generally be summarized into physical or logical factors in the following three dimensions:

• Vehicle Power System Hardware Anomalies: Fluctuations in the vehicle's main power network are the major external variables leading to this fault. For example, alternator output voltage being too high, battery voltage spikes (Voltage Spikes), or an unstable high-voltage supply environment directly cause the radar system's input voltage to exceed its normal operating range.
• Physical Status of Wiring and Connectors: Besides the components themselves, the wiring harness or connectors connecting the Left Rear Millimeter-Wave Radar may have impedance abnormalities or short circuit risks. Signal interference or electromagnetic noise caused by external faults may lead to control units misjudging power status, resulting in "false positives caused by other faults".
• Controller Internal Logic Operations: If the internal voltage reference of the Left Rear Millimeter-Wave Radar's own Control Unit (Controller) drifts or hardware ages, it may also lead to failure of its input voltage judgment thresholds, thereby triggering this fault code.

Technical Monitoring and Trigger Logic

The generation of this fault code follows strict embedded software logic, with its core monitoring mechanism based on dynamic sampling of supply voltage thresholds and time window determination:

• Monitoring Target: The control unit collects input voltage signals supplying the Left Rear Millimeter-Wave Radar system in real-time.
• Trigger Threshold Condition: When the input power supply voltage value exceeds the preset upper limit, satisfying the voltage condition >16V, the system enters a warning state.
• Duration Determination: Transient fluctuations are insufficient to set a fault; the system must monitor the duration of this high voltage state $\geq 2s$. Only when the high voltage signal exists stably for at least $2$ seconds in a continuous window is it confirmed as a valid fault event.
• Condition Dependency: The aforementioned voltage monitoring and logical determination are conducted only when the vehicle start switch is in the ON Position (Start Switch in ON Position), ensuring the system evaluates operating status only after the onboard power supply is connected.